What is the law of cosines?

The law of cosines states: c² = a² + b² - 2ab·cos(C). It relates the sides of a triangle to one of its angles and is used to find missing sides or angles.

What is the law of sines?

The law of sines states: a/sin(A) = b/sin(B) = c/sin(C). It relates the sides of a triangle to the sines of their opposite angles.

How does Heron's formula work?

Heron's formula berekens area from three side lengtes: A = √[s(s-a)(s-b)(s-c)] where s = (a+b+c)/2 is the semi-perimeter.

What does SSA (ambiguous case) mean?

When you have two sides and an angle opposite one of them, the solution may not be unique. Depending on the values, there can be 0, 1, or 2 valid triangles.

What are the different triangle types?

Equilateral (all sides equal), isosceles (two sides equal), scalene (all sides different), and right (one 90° angle).

Driehoek Calculator

Gratis triangle calculator using law of cosines, law of sines, and Heron's formula. Solve SSS, SAS, ASA, AAS, or SSA triangles and find area, perimeter, and triangle type.

Solve triangles using sides and angles. Bereken missing sides, angles, area, and type.

Law of Cosines: c^{2} = a^{2} + b^{2} - 2 ab cos (C) Area: A = s (s - a) (s - b) (s - c)

Gerelateerde calculators

Pythagoras Theorem Calculator

Find the missing side of a right triangle using the Pythagoras theorem.

Vierkantswortel Calculator

Bereken square roots and nth roots, controleer perfect squares, and simplify radical expressions.

Percentage Calculator

Bereken percentages direct: X% of Y, X is what % of Y, or percentage change.

Procentuele Verandering Calculator

Bereken percent change between two values: ((new − original) / |original|) × 100.